Update installer to 1.1.2.

Update installer to 1.1.2.

The most significant change in this update is that there are now two
seperate directories on the install medium, /etc and /etc.hdd :

- /etc contains the configuration used for booting the LiveCD only.
  It is NOT copied to the hard drive.

- /etc.hdd contains the default configuration used for booting from
  a hard drive.  It is NOT used for booting the LiveCD.  It IS copied
  to the hard drive, as /etc .

This avoids the `copy pristine files afterward' rigamarole and, in
so doing, simplifies both manual and automatic install routines.

The README file has also been updated to reflect this change.

Suggested-by: dillon (a while ago)